Robtex

Up: 77.234.46.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 77.234.47.0/25
Down right: 77.234.47.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.234.47.0	PTR	r-0-47-234-77.ff.avast.com
77.234.47.11	A+PTR	s.ns.avast.com
77.234.47.11	A	beta.ns.emfme.net
77.234.47.12	A+PTR	y.ns.avast.com
77.234.47.12	A	alfa.ns.emfme.net
77.234.47.13	A+PTR	ns6.avast.com
77.234.47.13	A	ns-a.anon.me
77.234.47.13	A	ns-06.avast.com
77.234.47.62	PTR	r-62-47-234-77.ff.avast.com
77.234.47.95	PTR	r-95-47-234-77.ff.avast.com
77.234.47.177	PTR	r-177-47-234-77.ff.avast.com
77.234.47.255	PTR	r-255-47-234-77.ff.avast.com